My Taboo Academy

The next morning.

I thought the constant erection would keep me up all night, but somehow I slept better than expected.

Yuna’s body was soft and warm against mine.

*Rub... rub...*

"Mmm..."

Still half-asleep, I buried my face against the back of her neck and breathed in her scent. My hips started moving on their own, slowly grinding my hard cock against the soft curve of her ass.

*Rub... rub...*

This was better than any dakimakura.

_...Dakimakura?_

My eyes snapped open.

What was I thinking?

Yuna was still trapped in my arms, completely unable to move.

I was shamelessly rubbing my dick against my little sister’s ass while half-asleep.

"Yuna... are you awake?"

If she had noticed what I was doing...

"..."

Her breathing was uneven.

She didn’t turn around, but the tips of her ears had gone bright red.

’I’m so fucked.’

Just a moment ago I had been nuzzling her neck like a newlywed husband and grinding against her.

And pre-cum was already oozing out of my cock.

"...I should’ve just gone back to my own room," I muttered, embarrassed.

"...."

It sounded like I was blaming her, even though I was the one who had pulled her close and started rubbing in the first place.

But how was I supposed to control myself while sleeping? She was soft, warm, and smelled so good. Even now the distance between us was almost nothing.

"...Do you want me to help you, big brother?"

"Help? Help with what?"

"A handjob."

"A handjob!!?"

My cock twitched hard at the memory of her touch. It was already fully hard, but somehow it got even harder.

Yuna still wouldn’t look at me. She kept speaking with her back turned, voice quiet and shy.

"I did say I would do it again..."

"So can I..?"

A tiny voice of reason screamed at me to shut this down and send her back to her room.

But the soft, teasing tone in her voice had already taken over most of my brain.

A handjob isn’t sex... so maybe it’s fine, right...? Right...?

No. There’s no way it’s fine.

Last time I had been out of my mind when I let her touch me. If I didn’t stop this now, things would only escalate.

I needed to get her out of this bed.

"Do you want to put it... here?"

The moment Yuna pushed her hips back slightly and opened her thighs just a little, my body reacted on pure instinct.

I pressed up against her and slid my cock between her thighs.

"Kyaa..."

Yuna squeezed her legs together, trapping me completely in the soft, warm pressure of her thighs.

"Ah... huh..."

A moan slipped out of me. The moment she heard it, her thighs tightened even more.

"Do you like your my thighs?"

"Do you like how they feel?"

Yes. Extremely.

I couldn’t say it out loud, but my hips were already moving, grinding shamelessly against her. Yuna tilted her pelvis slowly from side to side, making her thighs shift and squeeze around me. The sensation alone made it feel like I was about to explode.

I was thrusting against my little sister’s ass, silently begging for more, while she gently moved her thighs to help me.

"Yuna... Yuna..."

"Ah... yes... you’re trying so hard, big brother..."

Every time the tip of my cock peeked out from between her thighs, she reached down and stroked it gently, like she was rewarding me.

Using the pre-cum already leaking as lubricant, she carefully rubbed the head with soft fingers, careful not to be too rough.

Her hand around the tip, her thighs around the shaft, her soft ass pressed against the base.

My cock was completely surrounded by Yuna’s body. There was no escape.

I could only keep moving my hips until I finished.

"Ah... ah... ah..."

I rubbed against the soft heat of her pussy through the thin fabric, marking her without even realizing it.

I held her tighter while she stayed turned away, too embarrassed to look at me.

"Mm... ah..."

I leaned in and gently bit her reddened ear.

Her thighs clamped down harder.

The heat and slight dampness of her skin made everything feel even tighter.

My hand moved on its own and cupped one of her large breasts.

’I really can’t stop.’

"Brother..."

As if she could feel my hesitation, Yuna stroked the head of my cock again and whispered,

"It’s okay. Just let it out "

"Ugh...!"

I squeezed her breast.

"Mm!"

Yuna pushed her ass back harder against me. Now it wasn’t just sweat making everything slick.

My cock, trapped between her thighs, brushed directly against the wet heat of her pussy.

Yuna’s pussy was so warm

I couldn’t say anything that crude out loud, so I just kept thrusting against her soft cheeks.

*Thump... thump... thump...*

"I’m cumming...!"

"Yes brother, yes...ohhh...yeah"

I came hard between her thighs.

*Spurt... spurt... spurt...!*

"Kyaa...!"

I tried to catch it with my hand like last time, but most of it still ended up on the floor and across her legs.

*Twitch... twitch...*

I stayed pressed against her, breathing hard, completely spent for a moment.

But it wasn’t over.

"Ugh..."

Yuna squeezed her thighs around my still-hard cock again.

"Once wasn’t enough, was it, brother?"

I pulled her tighter into my arms. She let out a soft, satisfied sigh.

"Let my thighs take care of you"

Her thighs really were perfect for this.

I kept moving, cumming several more times while holding her close.

By the time we finally slowed down, Yuna was covered in a light sheen of sweat.

"Big brother... I really need to get ready for school..."

"Just one more... Please"

I clung to her shamelessly as I thrusted a few more times against her ass until I came again.

*Spurt... splat...*

"Ah... my thighs feel all tingly..."

"...Should we stop here?"

"Are you finally satisfied...? Wow..."

Yuna looked down at my still-hard cock with a mix of surprise and amusement.

"...Your future girlfriend is going to have a really hard time"

Yesterday I used my hand.

Today I started the morning by grinding against my little sister’s thighs.

I wasn’t sure if Lustbound was changing me, or if this was just who I was from the start.

Even while feeling pathetic about how easily I gave in, the soft pressure of Yuna’s thighs kept floating through my mind.

A little later, Yuna knelt down and started wiping the floor with tissues.

"I’ll clean it up. Just leave it."

"No. This isn’t something my brother should do. I should take care of it."

"...."

I wasn’t sure what she meant by that, but while she cleaned I found myself staring at the way her big ass moved as she wiped the floor.

My eyes met hers when she looked up.

"Brother..."

"Ah... about that..."

Before I could explain the way I had been looking at her, Yuna stood up with a shy little smile.

"Next time I’ll think of something even better."

"Next time?"

"Yes. Next time."

Her eyes curved into soft half-moons.

She had clearly noticed me staring at her backside.

I had zero control left.

"Wouldn’t you prefer if there wasn’t a next time, brother?"

"...The next time... isn’t important right now..."

From today on, my priorities had completely shifted.

"Yuna! Where are you?"

Cleo’s voice came from downstairs.

The morning suddenly became hectic.

Since Yuna was running late because of me, I decided to make breakfast for her.

Egg and mayo sandwiches. There was also a can of tuna in the fridge, perfect combination.

When Cleo came down later and started eating with real enthusiasm, I figured I hadn’t messed it up too badly.

’She probably doesn’t even know I made it.’

"What? Why are you staring at me?"

"...What color are your panties today?"

"Huh?"

"I was just asking."

Cleo stood up and left the table looking thoroughly annoyed.

It was fine. I hadn’t asked her to show me.

I was just trying to keep that strange new connection between us alive.

After seeing Yuna and Cleo off at the front door as they put on their school shoes, I got ready to leave as well.

They were taking public transport today. For some reason that made me feel a little disappointed.

I had actually enjoyed going to school with Yuna.

*Ding.*

A message from Yuna appeared.

[Yuna]

(A photo of her lifting her skirt just enough to show her panties)

Today’s panties are red. Cheer up, big brother.

...Alright.

Let’s survive today.

Fleshlight Man Ren Asahi, currently holding 54 coins.

I didn’t want to stay a D-class older brother to my two adorable sisters until the end of Lustbound.

Fortunately, today’s version of me felt strangely invincible.

I had already been thoroughly taken care of by my sister’s soft thighs first thing in the morning.

As ashamed as I felt for how easily I gave in to my lust, I also felt a strange new confidence about living in this world.

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